Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c683e5eca6ab0c…

MALICIOUS

PDF

71.7 KB Created: 2021-02-07 22:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a7a7d990f3032c0ef7097250e43d950a SHA-1: 7f9e251fe79db65f57a6fd37d708a7650a925df6 SHA-256: d4c683e5eca6ab0c82291c37aa9c6d0efda22b445b36c7c17d75ce2a4d6d8c9a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm on disposable hosting, strongly suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attack pattern designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/aws?utm_term=apgar+ka+full+form PDF link annotation
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/1402930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_601dd01894490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_5fdc374665716.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/aristophanes_assemblywomen.pdfIn PDF document text
    • http://eliyalte.com/free_printable_alphabet_worksheetswj068.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/djiYdie/2052154188.pdfIn PDF document text
    • http://repair-telefonov.ru/travertine_pavers_installation_guide0d29x.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/7366073.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/wilewa-zoperulumubix.pdfIn PDF document text
    • http://supermagazforsale1.xyz/icao_cargo_manifest_formatmxktg.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/5852291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_5fd38637f3152.pdfIn PDF document text
    • https://basapozixuw.weebly.com/uploads/1/3/4/7/134701575/kejigopafi_regizox_kapajiwubeti_romonikox.pdfIn PDF document text
    • https://pikimitif.weebly.com/uploads/1/3/3/9/133997727/5958507.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/jjijPih/sejeguluvobamade.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/402bf5.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/rorofixesug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buxazub.epizy.com/pixawekusib.pdfIn PDF document text
    • http://buzuxujov.epizy.com/pajemorewaxikukurexem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 5096 bytes
SHA-256: c36484f161a7a147b369e93df30d504be52cfaa57debe926f81c05e6f7fa2523
font_01_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 12100 bytes
SHA-256: a2c5b776462eb79c2c1dcf04ca49b80203e9b660ee108a87d992c8d0b0907b17

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